In recent years, studies have increasingly supported the medical value of cannabis in treating such conditions as multiple sclerosis, epilepsy and arthritis, and for dealing with nerve pain.

The study, entitled the Cannabis Research Plan, is to be a partnership between Oxford University and venture capital company Kingsley Capital Partners, who are investing £10 million to create a global centre of excellence in cannabinoid research.

Sir Patrick said marijuana products bought in the US had helped him regain use of his hands CREDIT: ANDREW MONTGOMERY

Prof Ahmed Ahmed of Oxford’s Nuffield Department of Obstetrics and Gynaecology said existing studies were beginning to produce exciting findings which could result in new treatments. “This field holds great promise for developing novel therapeutic opportunities for cancer patients,” he said.

The study has received celebrity backing from actor Sir Patrick Stewart, who uses marijuana to treat the symptoms of his ortho-arthritis. He told The Telegraph: “Two years ago, in Los Angeles I was examined by a doctor and given a note which gave me legal permission to purchase, from a registered outlet, cannabis-based products, which I was advised might help the ortho-arthritis in both my hands.”

Regular use of an ointment and chewy bar had allowed him to sleep at night, while spraying his hands during the day had brought back mobility, he said, enabling him to make fists.

“As a result of this experience, I enthusiastically support the Oxford University cannabis research plan,” he said.